| 摘要 |
TENNIS RACKET The stiffness of a tennis racket is adjusted so that the first mode of bonding of the racket under free-free constraint conditions is between 170 HZ and 250 HZ and preferably between 200 HZ and 210 HZ. The second mode of bending under clamped-free constraint conditions is between 215 Hz and 315 Hz and preferably between 230 Hz and 265 Hz. |
